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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc0c19770aa0fc4d8cff5202e129b4de81f993bf7163127c45021a5a4399c75' 
  AND token = 'LslBNuQMyWzN119gotcc57FXS8ZlDzBpKJ6roF50f5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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