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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa918e154d63079edaa0119ff5bda5fb812b7709fca8ea123992d8f82b9554d6' 
  AND token = '3Z3NOvZBxWY+5XW33CVXHMwZ+uk3AwuZDBdkfEotiv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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