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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e1d578dec58227362bcce797b587c050bb1857a513fef0c823a9eed46d76b4' 
  AND token = 'f/lmp4LXsAP2svPfWYsPmayBAX00nVW4JjSf1ZtCV/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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