SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc7b299443b597aff5ff7df0d36ddba0ba19adaa73fa857d0f9048a1c279f4c' 
  AND token = 'KHMi3CjxB6qd4cj42wQUIzKIJiGQHaKQr6IygV/xhP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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