SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8cbf73c47106cc70b47ea8358bd4a07d64e49b83472b08ae8d658f509669966' 
  AND token = 'dXCKUwL6QIMeDJu4jjfduiNJwsUgYd/uGqV5RSU8B1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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