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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c79b30a1a45acd6173f9ac9177a588475ecf8451ec89cef40e90a9cdd43afc' 
  AND token = 'iJBbu/xzLPRRqf48t6YuiEkUJehFXgzaZch/5xfmIDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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