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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc84e3b4e1d2bdbc1beb8567c3d1f62802a2af6cc7ad1a3785fc844319d690c' 
  AND token = 'eLvbcDX1qFI02x3wME0r0SoKRbwSxgO9ikUtibk1xTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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