SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca70f3b71bcbfec846d081ff95333ffc1a19682bdd43a72b52529325a0efceaa' 
  AND token = 'VY3Meo3z9Hp9V80uDJjjXv4+QkiNx8HDtuBqwl8H3/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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