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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71802bb5c2a91b499c5745514f69c7381d69eefeb7c3f3219a0636628129e6d8' 
  AND token = 'AnTRzGkyb6Ki8nx/QSGKrk0Hr/ACMUPMV+xv3iHjLCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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