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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6a9e5b9ce70b9e3af78af0c0f41090502174983e929fa469884ea930a9b8a3' 
  AND token = 'tAZvYWEwgmFJRxTvS2B6kNg0h0W3qLffVdeOihbbTT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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