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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd097b53ff3573f7cadc6dde0b9e8f58466e3a17406a8316d24ca3d3b304756' 
  AND token = 'oGTpkdj6LZ6BSbCHaBa7TZvzl58Q97NVDrhTPjVRnxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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