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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04a9607ce02f9aa24d232ba6fc6da9958cb8075021da5cb994e1b79e833aba4' 
  AND token = 'VSvJ13UQ2abZ0lkpGiuuapJvTla2DYQH1jZlRtd050A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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