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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a9a9947e5d7300c433ecb6aa91050457893c81946a4118801027d123f7eedd' 
  AND token = 'J4lJ9odkdQsA3a54TuRkXJR5iRQFYMD+uxr2M4k8Ulk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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