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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e85ca89f46652a6b6c0ab0e797028f820a2b727a42af690543dce9fd15a8e2d' 
  AND token = 'zWGdKH66cni9ZEWj1axaQWHkoV+KHZfrQHZ249J0umo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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