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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9340b677db7794bb4e42c261972c7c3d92574c9a21322f47dbcecf89af0134ec' 
  AND token = 'csnc2kWZeLJ6hdv6/XNhd+/aotQ9bRLqpUQxHW2DhkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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