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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513fb734f8b8b997b48f23634c3c6c03fdec87c738e591c2b4b19b99f454718b' 
  AND token = 'yh6qxexL5vn8J38J4DBZ8Xo59zNvyEzUA1MPfMtCEj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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