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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bba8d411cde1b7d7580ebe101713768575171ef0f1bbb83880de4973d76c47' 
  AND token = '0J9LE7/cz8AJkc9zfFNDB6mVBI7+T2YCCt5iYr7yiZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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