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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f9916b63907e6dd970f109092657ccc59c40b568b8cb659bf6ac9098f63059' 
  AND token = '83KsVbAkLxuNgwJCTgt8f8aQayprY4QVRKbVvfMGauQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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