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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa513efb0c93274ca26af6c75ba600ccabcd73ad466e2bd5cf3a6a15c257aca6' 
  AND token = 'ju2S2FpLIo5Lv9ca+1cWN9wVz3sVJxrAW7xDZ9adn8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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