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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe880c68289cb64786ef763d7dc4f8b9c557c8c7e1860850151c97b7069ece9' 
  AND token = 'vI8if3q0AbF09LsGR64+8PfSF/XdwotCtrO1H88Vf6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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