SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a93d2223d75313a03975b81c055225c405ed561192bdb1c6bd58606e95471d' 
  AND token = 'Vvvky9R+N0FW1L/e4RBAFJqmwXjuGmY5P9ObZVwJq0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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