SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0252910c1d769df7f7671fa3b4eb8a8659d659361dcb1596120aca1749adef4' 
  AND token = 'ZspwX93j3IC/vpNZhrM8adouOUjbD0zKX/WWthCmGDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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