SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037818341a0b724bbe4c3c1d3374d248ac0f1b40c12420f856799ea8a15d7fda' 
  AND token = 'NGZhUs4VIKpM3FQomH9waLKs7Qf4vELQqlezO/xfBQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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