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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9406dccf167a7f174bb583084c77deb85ea238e9fc35562b6cb765473462e68e' 
  AND token = 'UsybNukt6KKJoqh69TOU8FjHdFAtg0ei1v3o8euqX6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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