SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7406b13b27d7e6df586e6afb1b4ef3051e58c8953b0aca687956f453a66887' 
  AND token = 'PAc5Wd2BzlnGwsprL4KSloJ29lqc1/+EbXmaVX7va5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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