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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf92d8c6ee3589e08fee2cb7c03fc1a159e334f3f0d5c87c880419f6023f8d4' 
  AND token = 'iezKGWjrruN8Hd0wlXUAwYeu3crnI5M3f0MQK+0y5jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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