SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac7ba5d0e9d6845a3df07c8d60abc7c9196cfb18961ccabfc2729ca91ae4489' 
  AND token = 'NYv/+u5u+qxvS1GgTArPHRpChlE1s1FhGi1xXgw+S5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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