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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f040cedb6101b5a4d794ed992c8f363fed61fa3f00fc95fbde1fd1b524cdd00d' 
  AND token = '9yLCcK6ZXAu09qIUGzB1JKkoNs9nKf58WlOkglk9PBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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