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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7af93e1a6454b6baa7d1adb7ef82af61e2522d7e5de894d748678ee24968003' 
  AND token = 'rDePn81b7ZLjiIAAAPCw3bPiY295dxn1gB/zmNHGjig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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