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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fd55a8d8b263d949a06205d100b471d7b651a55e957b3cadb78ba21ab44fd3' 
  AND token = 'mmmPI/6kqCbtlRqZcLe1dYivoGT1IeF2wy5pXnKyK8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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