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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d1851b97de3d8a03a131b492b36fe631f58d8a7f6fb7117e9690a6b4dbc0d3' 
  AND token = 'p6O6wIGfLTKojt4BgIuPn0d1evtqZV2cM1UJiesFW4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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