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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a213bb96116caffe09f1daa47751b92a09e0aa4500330b23340e1c73c27f9d4' 
  AND token = 'Hnk9F/pemfwhDx5quMVfHOU8UZTOlJmD/F24x2QG8u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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