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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1cc2c877fe97747c6b90ea3b1ad60ff057b0bdaedc903004eac53742398759' 
  AND token = 'tkrODNN6uKXfekBTRB9DI/X2lBmpCFFMHZpMcwF2u2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}