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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da59ba5c0249509e54268f26be8e2015c2ac365728fff17e192502bc8ffe87dd' 
  AND token = 'qypivXZ8E80hWsGWSBqp24Lc67mDBOzBnkvYmzkmgPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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