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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba3141ab00d192eaaa2487028f976ab4e271a1a4d5a4534d0e0cff904e3d0ee' 
  AND token = 'N0MAC2c3PFF78WHPDRc8wnXs9bbaCb2vkWyk7oK/80k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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