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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c0bb61abe235cccb47b97ca85c6a2c9c222561c4e63ad247c21ef8dfdd461c' 
  AND token = '2aG76agSyab//mKlJQfek15MBGa495ugqQOfB/qH5v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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