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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d43be731b9bb58bd6b548a612bb6a20c85e95953508209184e83694ef2fe4d' 
  AND token = 'BCX+k6VHj6YkJT0FrHdWtvMsQUF6ZD3hMNfgd5E+m08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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