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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bcebcb1eefa09029f66eaae442d8a93ef2f01dc55a8fe8cb0ce491b476e1d17' 
  AND token = '6lJ8dhWtBy6Zw2SRen1pnOihTVZj+7VIVKnkvDbxLHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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