SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cebf9fb2b3db5c6fdae3b0025baab01d3fa84ee896d806133a86d965224550' 
  AND token = 's7H7+LE/81hqullnH28WLLjaszYsR4ZTGnwzFioGs6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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