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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487643df4dd4a65d682a880fd8383eb54e69aad397992e12f4ee7f711c4ede98' 
  AND token = '/uZJZElfu4DyHn3NH13Kz7RvfdQyX66B9P9XNFeY2oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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