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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f4e240a536a5635a6cd331dbf0c6b2d2e6b7f7cec3efaa3a3fc4f380d86a90' 
  AND token = '7aDz1iZW3+Ryf6BLeMYOs6GJPJiS7x4AfzQJwQ3c9bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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