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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cabc0861dda12c7619b79a82a1695584db3db9df849219e1806a5d707dbddb' 
  AND token = 'jRn9dSG5wg4mOkFnzc+tQ/B87BCkKDtU4ps0mr+nb+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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