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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5964a949a827add51727c8b859a30d717084ae5b47cc9c9841d2f9228f97ce8f' 
  AND token = 'j6837u0tJvIi6LrEpcPfDSFAczeAyE28Q+17oSbY+MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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