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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b6987b6f9f9a17ead9df5588a6dfd300812c9cf65a4fe0b91d0cfaa09935dd' 
  AND token = '33Nk0+Qgl9qXFhzIWpQ6MxwQWKDyKaT6D+KsT0V9hms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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