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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518a8b9422862d167d0c8d6bad6aa957d7f8ed62c0595e69254ad33a32a1b698' 
  AND token = 'LjGpelYtlttE7UnWXLlvccjBG+GW/MIbBnzds8ZJ3Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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