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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f92d34a01b54e5891afe7b6780b669c79df02725c8ad5d29f6ed0d79cea23c' 
  AND token = 'Xg65o8mD2pQIZucXFSMtaKilgZittPrGqDyKhY71rNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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