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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39c0c5d58e8ffc77c4cd04f3e28804570238effe4ca928eb4a99a42b851ade1' 
  AND token = '4Dp9PtVzzOQnWuqd8BJ4z1VWZMl7wU2knWWe+iCbz6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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