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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022099969e64bd0b424fc7eba28ea99863e57829d020a8023136819bd2549834' 
  AND token = 'k5UrQkTuWjlGjfS9SdyZwbl58JJU5AxAHrMqmXhNVeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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