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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1104567168950008fb1cccfd97df97928a8f210d79e307716a6dd708e43a2895' 
  AND token = '8E+J4rsVOxpASOSyboeM6bLt+Wt/GoiUEItb5dHSzbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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