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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8c8c2fbafab43f94e7b3566faa14ad24587884cbac078be0c6f011dfc10e70' 
  AND token = '4FCqJz5hifnbkb94UCxPb+xZR9ZaGF40F6IZv6gln7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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