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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ee3498549d4f3f79e6f92a65235af706e8fa254d9f05d075c856d8c549f3a0' 
  AND token = 'wYo1zQ3rNN+D6b2bIqrY779dm0T+2ESkduxBoJwCA9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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