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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e199693676c4d91f6226af7999c18b8d2ef4dbd3e25c53635826e3fa5f6bea' 
  AND token = 'EcOe9bZEbhU6k2MoH1K8T0+pujud/YzQDv9kTj45bPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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