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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2123b6dd12ada7f994065abc6c9b5734223f4f85dc0aa9ec136fd9c4c9fa6fe0' 
  AND token = 'VBm08vorqJ75LgOb3yg9sElD60nJMhRMAqm43aDAKJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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