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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8668363c0b1df3807948c60fc1f3c3fc99b3383988332efed65bcfe07f447b22' 
  AND token = 'AwPjtcD/898YpFQwtEOloFWfkDUqa/WJS+7H4sHm1qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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