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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd869c3e89166e655394101011a838d3e6d6d2991fdff8b3af81d568c16a2873f' 
  AND token = 'ZaK+uavnJek115NJtGhTXKEotGjysye67nIzyP1f8fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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