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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524bf0cae01021491fb8193180b338d23ebd0220690a89861b8391fbe9eb0868' 
  AND token = 'BDMfmTwMyaa9sZxrpWVC362gKaShZlvFEu2yXXzFBMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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