SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa27fc430793f36334ed5bf924d5f0df6bf29d639d66e17761d3289253b46d24' 
  AND token = 'WOV5ghS/H8uD8YCTfdHdvwKNZ85Meqv6G7Wnh8bH3PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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