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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6ceb1ea88ba560b974f079c5b915e0cb0e1f56d664026e4769771c66852c24' 
  AND token = 'URFoC5GVAVVE5b1JouHLpn5r7gjUc+T4X4YWBcv3jKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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