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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11732771c23759cb765a9ab56424c232eb0f87e43c2defe8c821c3d21474a24' 
  AND token = 'UvDRAc/46djTE/2gLWZdljMiT6K+j9IrQcObL3DF10U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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