SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ae92439bca2ac8d2b119ac7bf383bba6852f205eaf0ddabda7d90a5df1d66a' 
  AND token = 'AXHAKQ+hibJWXzZHxcLzljG1LvZcURXYTW4yKkWsjps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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