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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8f3abfab6506f9fd7add934552af49d3d45612e9f9cb752c22b9d742184b03' 
  AND token = '9Sd84ofmsD+MusjbUdUQe+H1ZhI0bWknAO15e6QCf/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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