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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923ef444694a74caf2ca7bd8f4a90d56fefca9a0eb7d713b340ae9e0069dcde5' 
  AND token = '5vweDlvli/96ILXy6iEIj/6Hzj8WvZ8HKcEDTmqAQi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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