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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99913d25f8af4ce47ec6c4e95d69ae95916b5dbebd67b9719a10edd3074f407' 
  AND token = 'HiaCiR9+OQD2eeF881vh2i+E1oxWSDHKut2cgtkvx6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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