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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b127402b5f860ed92b15b5f7d8511a70c62bb95f54972e89f704654c063910' 
  AND token = 'g9uyoGisYKLewEChyNcZ32i3T2fyczZfdPtAjXPOIpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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