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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3be3bf959d3bd3fce296c363a3d3109c210c8fc409fd21c4bde0ef83a49468' 
  AND token = 'dznxbkkU7vIi/OfXpBGcN+suB7TzUc6I9ZeALMsIX+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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