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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f085e79e8a5fc2fc6d1d42aa7edd77c1d81f83e97e1334d3a4941e7ba12549' 
  AND token = 'ejmSgP9Mj/nZ7eWqwmLL/MTWXBCd6lC3RnBVzDrx+eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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