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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd36fb3ca657c7711520439f906140156e63bff861bfe37dda4cd049eb1d88f8' 
  AND token = 'l3smDUJH9l5L/YU/OL+b9zsinKOeTKZLrOk/FobdPq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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