SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652a22169e4b26c15f432f97d0b1573a040be20b20168472d5391e1fc86e4d06' 
  AND token = 'lfyyTkWYqh7sXgp/zRrzG6VvjTRJH5P9lAV0Iv93/Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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