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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35998c79118e842633a157cf212b94ae2c31b87e7186fc33fe5ce47bcd691ab0' 
  AND token = 'H9huc9knDIDg0LWPVH5T8lUdsaGuufQ7bZS51cW/st4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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