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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92aa21e917213fdc26bf00448aa8230a54194f44604b5bbbe711339bb65aaa9' 
  AND token = 'sZXYAurop+l1zO0fWWXoq5Otl/18nXqZKAK4Uk5Rv1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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