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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb294b07f8d2c2ecf727d2fa3cb2b902241c3c72f9c44ee41d618ef7d13e8fba' 
  AND token = '4FtbmOcUfm3JeY9NZMUXYUZB2zz2r8b3NNbnNPUdQrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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