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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d36c15c82138e706f503a9382b37206d095886e2d1391599e9c26755722418' 
  AND token = 'WqOkxAZELIV9H/giCjdFVX7nHBeQxINoKyf60eFjv3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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