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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f5729a4f405fe54a09bf13eae995f3a4e0f1139fe492f7e97cc2be19951840' 
  AND token = '3B5KZKW2vwaWaVJ1IoV8bawySEl8abW4kpqwAAAcn0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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