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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0953b5c9c7fc991576821b46907762ac389f53ede2a937be3be63b3970241f63' 
  AND token = 'Ujup/z544sH8qElKhBziy2B65QLxqEiyqm69HgUE/4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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