SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e592b5814ab4e448db3f19f1d6199c316b8719b296f78c48f486c26d2c640815' 
  AND token = 'w8+lmZH7EjPcmzY1C3zvyw8v8VB/UNkptj27/sqJ05I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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