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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e3844abce10f56f7d179b27bee63d7717a6727e4b84722f238c894701ad3c3' 
  AND token = 'QTXlCthqAm6mQcI7CKPY3dclYwZQ7v2LY6e1F9xsgCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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