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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9cb3dfb663060e54b75f2ab076f6a925fb4ca7241b28cc322d6d8064fc9f19' 
  AND token = 't4HSnqNj5h/qVfI+qLS0VDD9PAvxYQOVYprt0uY4cFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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