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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a863336f6341ff480a9be130038d01a3bf82a3bb469f3df3edf811cea35ece' 
  AND token = '23Qmm5xKaqnPAqUGe+TP2OdPCi/WbBokoK6JbhOvUDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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