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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8951bf2baf0c482ea514121572e62bf968d7969c403517a9ee434df3c202b7' 
  AND token = 'M8UTBucXIM/Zr7yJuyDp0qC+q+5Sq/ypR9dh1I/fTkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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