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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0dcb97b3b4003557b8995c60621c38724cb159ea0f3d09e3b24348c9b8bd96' 
  AND token = 'LzWxiaMDHoJSLVaH22TL/TC6B20S7dREbou+E7piysY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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