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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da789a105d6cfcb173d4438b56c79de62791ed7d9631e36ec44db9552b4ce0d' 
  AND token = 'vqRmdWTHTClF6XSuYuoWlhW9/E0ouWDchPmlTXki8ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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