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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0d7d55f08f915664f8a1753f614c0fc819fb732eff5f402b2fd65f58c5d3e3' 
  AND token = 'K76R3qhOKOqVjr0MSUDJpP1bGNL0CIqRnP1udcinaeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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