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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac9172c99b72c7dff61b9685cde2565bc5abb02d2db37ebc3a292d1d34d97f7' 
  AND token = 'Waf9s1nxyvmB7r2hnfvor2vnJICpLLK8BSSmNslST8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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