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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832889b629c49db64ceb63bbfc110d0a3d87e5bb3804615c3f1e2982b5798e79' 
  AND token = 'orHEklVlZ1tlnKeiZ33hdmWAmK+6lkExqSlQOgFXUgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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