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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7b3ef54f4f8b4165de406763cb04a7bca737309fc4075da02f71ffe41520b0' 
  AND token = 'gV7u4IyskZSWK6PXcoHiV6a+ikG+lGCim+oz2yV5zrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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