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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685eecf96b0102482df4b33f7ec0900c242a6cad9dc42f37d33225f928b315a3' 
  AND token = 'Uys92B5+v/ITOXbn6J++cYxSwv5hu7Z99wv9rmmV270=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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