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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb7eb22ffb7c5b689f4bc1ad37a34e2830f230b5635b1262d2d337e40ef4284' 
  AND token = 'Fh6jHQPsbNbYQjxq8L8LbUiKeFzZyckQEXLOf619WEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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