SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7c2da74b50b8f3f59948c7dc2ec1959d20dd56abf5d9766bd61eebcae68c13' 
  AND token = 'quSHGAmhHbR+vWqHsPGnnQkV4HsgapjAc4R+XFkcuGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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