SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432158fb766a4c37cf3a4c4002fd2528681eb7ee7b5951aba7ddeab146ec1255' 
  AND token = 'Q0MGAZFpXREzTH6mzHX8uWWB9YCyA6ZCpxJoPfJJIqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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