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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd6fe406220ff6c4d6ee698a3b9039e9b19b01d838ec27a83fc29fb06122afb' 
  AND token = 'GMYvdHnvhR+qqi84kEQeR9Ljt1jxDfUN6Kg2crCXb88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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