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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cf1ad088877081ccb8067db2605aca373a10ffec6ac11ca40cb1e7e354c916' 
  AND token = 'gOfq4uBWueKAAWBnKe2Eq6kQMvg/0fegjSgKBl7Bd9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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