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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32d047f2f658775c5dace129eed6a6786837a43052fb258784b0ff85bbd09a6' 
  AND token = '9TpAVPx/Mcq8drxlFxIudZ9SzCuxXeMP5fG8FX0Pd68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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