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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a02250e1637fedf6fe9efe0cbc6ae6d05fa7fb0e09b906068e1ec9f8ce59fb' 
  AND token = 'AFf/M9RzzwHDC53IFY+vupblfQrrb25nT0jrTNili/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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