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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90ed6de77b773ca65fe184a20dc6966da0cae881a806de1db403cd45200d838' 
  AND token = 'oDGJWfvxbBbg7AjEp2sBibbOrdhYcCA3uO7dFou7k1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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