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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0d353ed3a486608939a531b12266fabaac643c36380652c8cd464621e1c5c4' 
  AND token = '7jhweA8sFu7F1upvXN76Osaq+HWX/t5ioKHwTXb2678=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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