SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229505b273d7306b6cc45095c41ffe267320cc4f0187f7d046d875ba79cb99fd' 
  AND token = 'k4OG+TB7GSbKqoP5lJE+iStwnw8vlj32GQ69a32DhBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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