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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a905eb4e9bb59f1c78df09fe574cc100902fc2d17b085b6cdfdd9b5a7b5bbaa2' 
  AND token = 'M59CoK1j0ciBRDPYQVHUtN5ybWZ0raAo3Q2HTbS+Ccs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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