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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c254db5aedec9d4cd417ca5bece6c600a79c94fdc5445a559a659bba526f43' 
  AND token = 'hIrMf/19ipyFCrgIpHz7wg5HsNnPGYgZF4JJWUqJa7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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